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Proceedings Paper

Polychromatic in-situ transmissometer for measurements of suspended particles and yellow substance in water
Author(s): Hans Barth; Rainer Reuter; Uwe Stute
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Paper Abstract

Hydrographic conditions are often characterized by large amounts of dissolved and particulate matter. These substances influence the optical properties of seawater, and the radiative transfer in the water column. The attenuation coefficient is an optical parameter which depends sensitively on suspended and dissolved substances. An instrument has been developed for measuring spectral attenuation coefficients over a wavelength range form 370 to 730 nm. The optical path length can be set between zero and 400 nm, which allows an application in a wide range of turbidity. The variable path length enables a calibration of the instrument during in situ measurements, which makes it suitable for long-term applications where signals from conventional instruments would degrade due to biofouling of optical windows. From the data, the concentration and size distribution of suspended particles, and the concentration of dissolved organic matter are derived in real time. Algorithms based on Monte Carlo methods are available for a specific evaluation of non-chlorophylleous particles and phytoplankton. Results of field applications are reported.

Paper Details

Date Published: 6 February 1997
PDF: 9 pages
Proc. SPIE 2963, Ocean Optics XIII, (6 February 1997); doi: 10.1117/12.266372
Show Author Affiliations
Hans Barth, University Oldenburg (Germany)
Rainer Reuter, University Oldenburg (Germany)
Uwe Stute, University Oldenburg (Germany)

Published in SPIE Proceedings Vol. 2963:
Ocean Optics XIII
Steven G. Ackleson; Robert J. Frouin, Editor(s)

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